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