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