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