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