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