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