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