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