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