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