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