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