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