One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,11,20,9,14,10,13)(7,8,16,19,12,18,15,17)(21,22,25,29)(23,30,32,35)(24,26,33,28)(27,31,36,34)(1,2)(3,4)(5,7,9,12)(6,8,14,18)(10,16,11,15)(13,19,20,17)(22,26)(24,33)(27,35)(28,29)(30,36)(31,34)(2,4)(5,8)(6,12)(7,14)(9,18)(10,19)(11,17)(13,15)(16,20) involution — undirected(10,11)(13,20)(15,16)(17,19)(21,23,25,32)(22,27,29,36)(24,34,33,31)(26,35,28,30)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.