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