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