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