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