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