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