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