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