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