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