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