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