One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,9)(6,7)(8,11)(10,12)(13,16)(14,15)(17,18)(19,24)(20,21)(22,31)(23,25)(26,28)(27,32)(29,30)(33,34,39,36)(35,37,40,42)(38,41,47,44)(43,45,48,46)(2,7)(4,8)(9,15)(12,13)(17,19,23,27)(18,24,25,32)(20,28,29,22)(21,26,30,31)(35,40)(37,42)(43,48)(45,46)(18,25)(19,27)(20,29)(26,31)(33,35)(34,37)(36,42)(38,43)(39,40)(41,45)(44,46)(47,48) involution — undirected(1,3)(2,8)(4,7)(5,10)(6,11)(9,13)(12,15)(14,16)(17,20)(18,21)(19,28)(22,27)(23,29)(24,26)(25,30)(31,32)(33,36,39,34)(35,42,40,37)(38,44,47,41)(43,46,48,45)(1,4,6,8)(2,3,7,11)(5,13,14,12)(9,16,15,10)(17,21)(18,20)(19,26)(22,32)(23,30)(24,28)(25,29)(27,31)(33,37,39,42)(34,40,36,35)(38,46,47,45)(41,43,44,48)(1,5,6,14)(2,9,7,15)(3,10,11,16)(4,12,8,13)(17,22,23,28)(18,26,25,31)(19,20,27,29)(21,24,30,32)(33,38)(34,41)(35,43)(36,44)(37,45)(39,47)(40,48)(42,46)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.