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