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