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