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