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