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