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