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