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)(12,18)(19,20)(21,22)(23,26)(24,32)(25,28)(27,30)(29,34)(31,36)(33,35) involution — undirected(1,2,3,4)(5,7)(6,12)(8,10)(9,15)(11,18)(13,20)(14,19)(16,17)(7,18)(10,19)(12,17)(15,20)(21,23,27,25)(22,28,30,26)(24,31,34,35)(29,36,32,33)(5,8)(6,13)(7,10)(9,16)(11,14)(12,20)(15,17)(18,19)(21,24)(22,29)(23,31)(25,35)(26,33)(27,34)(28,36)(30,32) involution — undirected(5,9,11,13)(6,14,16,8)(7,15,18,20)(10,12,19,17)(21,25,27,23)(22,28,30,26)(24,31,34,35)(29,33,32,36)(5,10)(6,15)(7,8)(9,12)(11,19)(13,17)(14,18)(16,20)(21,26,27,28)(22,23,30,25)(24,33,34,36)(29,31,32,35)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.