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