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)(17,18,21,26)(19,24,29,23)(20,25,22,27)(28,32,30,31)(1,3,5,4)(2,6,7,8)(9,11,12,15)(10,13,14,16)(19,28)(20,22)(23,31)(24,32)(25,27)(29,30)(1,4,5,3)(2,6,7,8)(10,14)(13,16)(17,19)(18,23)(20,28)(21,29)(22,30)(24,26)(25,31)(27,32)(17,19)(18,24)(20,28)(21,29)(22,30)(23,26)(25,32)(27,31) involution — undirected(17,20,21,22)(18,25,26,27)(19,28,29,30)(23,31,24,32)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.