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