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