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