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