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