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