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