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