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