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