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