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