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