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