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