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