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