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