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