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