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