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