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