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