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