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