One vertex per element, one color per generator, with an edge from x to x·s.
(17,18)(19,20)(21,29)(22,26)(23,24)(25,32)(27,30)(28,31)(34,38)(35,41)(40,46)(43,44) involution — undirected(1,2)(3,8)(4,5)(6,7)(9,13)(10,14)(11,16)(12,15)(17,19,23,27)(18,20,24,30)(21,31,32,22)(25,26,29,28)(33,34,37,38)(35,42,41,39)(36,40,45,46)(43,48,44,47)(2,7)(4,13)(8,15)(10,16)(18,24)(19,27)(21,32)(26,28)(33,34,37,38)(35,39,41,42)(36,40,45,46)(43,47,44,48)(1,3)(2,8)(4,10)(5,14)(6,12)(7,15)(9,11)(13,16)(17,20)(18,19)(21,28)(22,25)(23,30)(24,27)(26,32)(29,31)(33,35)(34,39)(36,44)(37,41)(38,42)(40,48)(43,45)(46,47) involution — undirected(1,4)(2,9)(3,10)(5,7)(6,13)(8,11)(12,16)(14,15)(17,21)(18,25)(19,22)(20,28)(23,32)(24,29)(26,30)(27,31)(33,34)(35,39)(36,40)(37,38)(41,42)(43,47)(44,48)(45,46) involution — undirected(1,5,6,9)(2,4,7,13)(3,11,12,14)(8,16,15,10)(17,22)(18,26)(19,21)(20,29)(23,31)(24,28)(25,30)(27,32)(33,36,37,45)(34,40,38,46)(35,43,41,44)(39,47,42,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.