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