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