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)(23,30)(24,33)(25,31)(26,28)(27,35)(29,32)(34,36) involution — undirected(1,2)(3,4)(5,7,10,17)(6,11,13,15)(8,16,9,18)(12,19,14,20)(22,28)(23,24)(31,35)(32,34)(2,4)(5,8,10,9)(6,12,13,14)(7,16,17,18)(11,19,15,20)(21,23,26,24)(22,29,28,36)(25,32,27,34)(30,31,33,35)(6,13)(11,15)(12,14)(19,20)(21,24,26,23)(22,30,28,33)(25,32,27,34)(29,31,36,35)(2,4)(5,9,10,8)(6,14,13,12)(7,16,17,18)(11,19,15,20)(21,25,26,27)(22,31,28,35)(23,32,24,34)(29,33,36,30)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.