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