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