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