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