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