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