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