One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,13,16)(11,15,12,14)(17,18,21,25)(19,27,20,23)(22,31,30,26)(24,28,32,29)(2,5)(6,8)(11,12)(14,15)(17,19)(18,23)(20,21)(22,28)(24,31)(25,27)(26,32)(29,30) involution — undirected(10,14)(11,12)(15,16)(17,20,21,19)(18,24,25,32)(22,28,30,29)(23,26,27,31)(1,3,4,7)(2,6,5,8)(9,11,13,12)(10,15,16,14)(19,20)(23,27)(24,32)(28,29)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.