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