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