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