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