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