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