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