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