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