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