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)(11,14)(12,15)(13,16)(17,18,22,25)(19,27,28,42)(20,24,32,40)(21,34,36,26)(23,35,37,30)(29,43,31,45)(33,48,47,41)(38,46,39,44)(11,12)(14,15)(17,19)(18,23)(20,31)(21,35)(22,28)(24,39)(25,37)(26,42)(27,34)(29,32)(30,36)(33,44)(38,40)(41,43)(45,48)(46,47) involution — undirected(1,3,5,4)(2,6,7,8)(9,11,13,12)(10,14,16,15)(19,28)(20,32)(23,37)(24,40)(27,42)(30,35)(33,47)(41,48)(9,12,13,11)(10,15,16,14)(17,20,22,32)(18,24,25,40)(19,29,28,31)(21,33,36,47)(23,38,37,39)(26,41,34,48)(27,43,42,45)(30,44,35,46)(1,4,5,3)(2,6,7,8)(10,16)(14,15)(18,25)(20,32)(23,37)(26,34)(27,42)(29,31)(33,47)(44,46)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.