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