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