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