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