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