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