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