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