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