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